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afla necunoscutele daca:a+b=180 si a=b×5

Răspuns :

=>5b+b=180
6b=180
b=30
a+30=>a=150
(bx5)+b=6xb
6xb=180 =>b=180:6 =>b=30
a+30=180 =>a=180-30 =>a=150